Sensory Evaluation of Various Lamb Meat Foods by Judging Consumers

Sensory Evaluation of Various Lamb Meat Foods by Judging Consumers

KUKOVICS & NÉMETH: SENSORY EVALUATION OF LAMB MEAT FOODS BY CONSUMERS Acta Alimentaria, Vol. 43 (2), pp. 254–263 (2014) DOI: 10.1556/AAlim.43.2014.2.9 SENSORY EVALUATION OF VARIOUS LAMB MEAT FOODS BY JUDGING CONSUMERS S. KUKOVICS* and T. NÉMETH Research Institute for Animal Breeding and Nutrition, 2053 Herceghalom, Gesztenyés u. 1. Hungary (Received: 6 November 2012; accepted: 24 February 2013) Four kinds of lamb meat foods (Wiener sausage, ham, roasted meat, and roasted leg) were developed based on 8 different genotypes to improve lamb meat quality and quantity, and to study the differences among them. The stringiness, flavour, and odour of the products were judged in food sensory evaluation by a total of 265 (60% male and 40% female) randomly selected consumers. In stringiness and flavour five (from 1 to 5), and concerning odour three (from 1 to 3) categories were created according to decreasing quality. The consumers represented different age groups: below 20 years, between 21–30, 31–40, 41–50, 51–60, 61–70, and above 70 years. The groups of consumers were involved in sheep farming, other animal farming, other agriculture sector, industry, catering, education, other service; administrative department of the state, were students, and others. Analyses of variance were calculated to estimate the effects of the genotype of lamb, the gender, age, and occupation of judging consumers on the sensory evaluation of the meat foods. In conclusion, new lamb meat foods were highly appreciated by consumers, who made definite distinctions among genotypes according to flavour, stinginess, and odour. There were significant interactions between gender, age, and occupation of consumers as well as sensory evaluation of various lamb meat foods. Keywords: lamb meat food, genotype, sensory evaluation, consumer, gender, age, occupation In Hungary, lamb and mutton meat are dominantly consumed as stew/ragout, sometimes as soup, but other kinds of dishes are not really made. The average lamb/mutton meat consumption is 300 g per year per person. In the down-towns and in the capital the lamb and/ or mutton meat consumption is not typical; however, it is available in the supermarkets. The traditional lamb or mutton dishes are cooked in the country (as a kind of stew), often in festivals, animal fairs, food exhibitions. As people are prejudiced against the mutton meat because of its fatty flavour, the meat must be altered to satisfy the consumer preferences and/ or improve the knowledge about this kind of meat. There is a strong correlation between sensory attributes. Because the tenderness is a major factor for consumer acceptability of meat, the low or high score for tenderness attract the low or high score for flavour, juiciness, and overall acceptability (BUNCH et al., 2004). The moistness is in high correlation with sustained juiciness, while adhesiveness and chewiness highly correlate with hardness (GORRAIZ et al., 2000). Juiciness is related to both the capacity of the muscle to release its constitutive water (initial juiciness) and the infiltrated fat content (sustained juiciness) (DRYDEN & MARCHELLO, 1970); however, initial juiciness and moisture content are in negative correlation (HOFFMAN et al., 2003). The sensory values and quality of lamb meat are influenced by several factors. As the breed can influence the acceptability of meat, several studies were made on comparing the meat of wool and hair sheep breeds (FAHMY et al., 1992; HORCADA et al., 1998; BRZOSTOWSKI et al., 2004; TEIXEIRA et al,. 2005). The hair sheep (especially St. Croix lambs) meat were preferred to the meat of wool sheep (BUNCH et al., 2004) and coarse-wool breeds (DUCKETT & * To whom correspondence should be addressed. Fax: +36 23 319 133 /ext. 120; e-mail: [email protected] 0139–3006/$ 20.00 © 2014 Akadémiai Kiadó, Budapest KUKOVICS & NÉMETH: SENSORY EVALUATION OF LAMB MEAT FOODS BY CONSUMERS 255 KUBER, 2001). The Callipyge phenomenon was clearly found less acceptable than the non- Callipyge breeding groups using a trained panel for sensory analysis. Breeding groups had a greater impact on tenderness than on flavour or juiciness B( UNCH et al., 2004). The lamb from fine-wool breeds had more intense flavour than coarse-wool breeds (DUCKET & KUBER, 2001), while prolific breeds (Romanov and Finnsheep) had a higher percentage of off-flavour than a standard meat-type breed, such as the Suffolk breed (FAHMY et al., 1992). Crossbreeding influenced only some of the sensory parameters. The meat of crossbred lambs had significantly higher tenderness and juiciness than the meat obtained from purebred Pomeranian lambs (BRZOSTOWSKI et al., 2004). According to HOFFMAN and co-workers (2003), breed did not have a significant effect on sensory quality (aroma, sustained juiciness, first bite, residue, and flavour) of lamb meat, except for Dormer × South African Mutton Merino lambs, which showed a significantly higher initial juiciness compared to Suffolk × Merino lambs. Meat flavour is also impacted by the nutrition of the lambs before slaughter (MELTON,1990; FISCHER et al., 2000; GORRAIZ et al., 2000; SAÑUDO et al., 2000; BUNCH et al., 2004). Intensity of flavour is increased with grazing on white clover, alfalfa, and certain crop aftermaths. Grain feeding alone or supplemented while on pasture typically produces lamb with more acceptable flavours than on pasture alone. However, the extent at which flavour intensity is altered depends on the type of forage and grain consumed. Supplementation of diets with oils or protected fats increases PUFA content and results in increased intensity of off-flavours associated with autooxidation of PUFA during cooking (DUCKETT & KUBER, 2001). Since the consumer preferences and cuisine traditions are various, the meat flavour is also different according to the slaughter weight (HORCADA et al., 1998; BERIAIN et al., 2000). Lightness decreased with increasing live weight and the light lambs had higher yellow index than the heavier lambs. The heavy carcasses had more flavour intensity than the light ones (TEIXEIRA et al., 2005). With the age (in relation with the weight) of lambs at slaughtering the likelihood of off- flavour in meat of male lambs increases. Seven-month-old male lambs had more undesirable meat characteristics compared to the three-months-old male lambs (ROUSSET-AKRIM et al., 1997). Only small differences were observed in palatability of meat from rams and wethers weighting below 55 kg body weight and slaughtered before the age of six months (NOTTER et al., 1991). The sex of lambs can also alter the flavour of the meat. In Norway, significant off- flavours of male lambs meat were found compared to female lambs, when the slaughtering took place before the mating season (in October/November) or after the mating season (in March/April). Even when lambs were slaughtered in mid-September, minor differences between genders were still found (MUSHI et al., 2008). On the contrary, there is a tendency to a higher intensity in sour odour in meat from female lambs compared to meat from male lambs and a tendency to a higher intensity in rancid odour in meat from male lambs compared to meat from female lambs (LIND et al., 2011). Consumers could distinguish lambs according to their origin and their preferences. Dominantly well trained panellists were making sensory examinations of various meat (including lamb meat), but even on family level the not trained panellist could make differences among breeds of lamb according to their preferences. The cultural background and previous experiences or knowledge affect the preferences of the panellist (WARD et al., 1995; SAÑUDO et al., 1998; 2000). Although the sex of the lamb has significant effect on meat quality, the acceptance of the lamb meat according to gender of the panellist has not been studied. Also limited information Acta Alimentaria 43, 2014 256 KUKOVICS & NÉMETH: SENSORY EVALUATION OF LAMB MEAT FOODS BY CONSUMERS is available on the effect of age and the occupation of the panellist on the ratings of sensory attributes of lamb meat. The main aim of this present study was to examine the acceptance of various lamb meat foods by the untrained panellists, who are the real consumers. The other aim of this study was to investigate the ability of the panellist to distinguish between breeds; as well as the effect of gender, age, and occupation of panellists on the sensory evaluation. 1. Materials and methods 1.1. The animals Lambs belonging to different genotypes were indoors fattened ad libitum on pelleted feed with limited grass hay supplement. Transylvanian Racka ewes were harem mated by rams of the following terminal breeds: Transylvanian Racka, British Milksheep, Charollais, Ile de France, German Blackhead Mutton Sheep, German Mutton Merino, Suffolk, and Texel. Forty lambs (20 males+20 females) per genotypes were fattened up to 27–30 kg of live weight category, on approximately 60 days after weaning at 16–18 kg body weight. Half of the lambs (10-10 male and female) from each group were slaughtered. 1.2. The preparation of samples After the S/EUROP classification, bisection, dissection, boning, and measuring the meat were handled by genotypes. Samples for different products were separately packed into plastic bags, and after slow cooling they were frozen and kept at –20°C temperature until processing. The meat was gradually de-frosted and three products were developed and manufactured at Biharnagybajom Slaughterhouse and Meat Processing Ltd: Wiener sausage (8 kinds); cured, smoked, and cooked ham (8 kinds); kitchen ready seasoned, cured, sliced, and roasted lamb meat (8 kinds). The manufacturing process was similar for all genotypes. The prepared meat products were aged for three days, four weeks, and two days in the previous order. The hams were smoked for 24 h following four weeks of aging, and after two days of rest they were cooked, then cooled down and kept at 8 °C until presentation.

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